Arm attachment.



A. T. CRAWFORD.

ARM ATTACHMENT.

APPLICATION FILED SEPT. 18, 1915.

Patented Sept. 26, 1916.

. ALDYN T. CRAWFORD, OF CARMEN, OKLAHOMA.

um arracnmnn'r.

I Specification of Letters ratent. Patented Sept. 26, 1916- Applicationfiled September 18, 1915. Serial No. 51,448.

To all whom it may concern:

Be it known that I, ALDYN T. CRAWFORD, a citizen of the United States,residing at Carmen in the county of Alfalfa and State of Oklahoma, haveinvented certain new and useful Improvements in Arm Attachments, ofwhich the following is a specification, reference being had therein tothe accompanying drawing.

This invention relates to arm attachments and has for its principalobject the production of a simple and eflicient means for assisting inholding various articles in engagement with thestump of an arm, therebyallowing the instrument to be readily operated or moved as desired.

Another object of this invention is the production of an arm attachmentwhich is provided with a clamping portion so as to fit upon differentsized arms, whereby various articles may be retained in engagement withthe arm so as to be used as desired.

Another object of this invention is the production of an arm attachmentwherein the loop is provided with a nut so constructed as to readilyretain the clamping jaw in a desired set position so as to facilitatethe accommodation of various sized arms. a

With these and other objects in view this invention consists of certainnovel combinations, constructions, and arrangements of parts as will behereinafter fully described and claimed.

In the accompanying drawing: Figure 1 is a detailed perspective view ofthe arm attachment as constructed in accordance with this invention.Fig. 2 is a vertical section through the arm attachment. Fig. 3 is avertical section through the arm attachment taken at right angles toFig. 2, portions of the device being shown in elevation. Fig. 4 is afragmentary plan view of the inner upper portions of the loop.

Referring to the accompanying drawing by numerals it will be seen thatthis arm attachment comprises a loop 1 which is formed from a singlestrip of materlal. This loop is adapted to be formed of any suitablemetal, and has its ends overlapping, as clearly shown in Figs. 1 and 2so as to allow the rivets 2 to be passed therethrough forfixedly-securing the two ends in engagement with the body portion of thelooglld,

thereby holding the device in an assem position. The ends 3 of the loop1 are spread apart, as shown at 4, so as to carry 'the nut 5. Theopening 6 through this nut registers with the openings 7 formed in theends 3 of the loop 1, so as to receive the set screw 8. This set screw 8has a flat grip portlon 9, which will facilitate its rotation in eltherdirection for causing theset screw to elther pass into or be partiallywithdrawn from the inner portion of the loop 1.

The lower end of this'set screw 8 is provided with a head 10 so as tocarry the bowed clamping jaw 11 which ispivotally mounted thereon, asshown in Figs. 2 and 3.

When this device isin use the set screw 8 may be rotated by means of thegrip 9, so as -to draw the jaw 11 toward the inner upper portion of theloop 1. The stump of an arm may then be passed into this loop 1, atwhich time a pencll, or any other article may be placed upon the stumpof the arm,

as indicated in dotted lines in Fig. 1. The r set screw may then beoperated again by means of the grip 9 so as to cause the set screw topass 1nto the inner upper portion of the loop 1, thereby causing the jaw11 to clamp upon the article as well as upon the stub or stump of thearm so as to cause the attachment to be readily carried upon the stumpof the arm, andthereby retain the article which is being used in itscorrect position. It is, of course, obvious that the article may becarried in the lower portions of the loop so as to be engaged by theloop 1, or may be carried so as to be engaged'by the jaw 11, for in bothinstances the article will be firmly gripped so as to prevent itsaccidental displacement when in use.

It will be noted that the lower portion of the loop 1 is provided withthe apertures 12, and through these apertures screws or other means maybe passed for the purpose of securing anything desired to the outerportions of the loop. For instance, when the screws are passed throughthese apertures 12 they may be passed into engagement w th a violin bow,so that a violin may be easily played by the movement of the bow whichwill be positively held by the loop It W111 be seen, however, that whenan article is attached to the outer portions of the loop bypassing-securin means through the apertures 12, the article must befirst secured to the attachment, at which time the stump of the usersarm may be passed through the loop so as to allow the jaw 11 to beclamped upon the arm and thereby holding the attachment in a setposition for facilitating the operation of the bow or other elementcarried thereby.

By referring particularly to Figs. 1 and 2, it will benoted that thespaced portions of the ends 3 fit snugly upon the side surface of thenut 5, but as soon as these spaced portions pass the side edges of thenut 5, they converge decidedly so as to bind upon the side edges of thenut 5 and thereby positively hold the nut from rota-tion. Consequentlywhen the set screw is rotated in either direction it will positivelymove either inwardly or outwardly so as to move the jaw 11 as desired,inasmuch as the nut will be positively held'ina set position.

From the foregoing description it will be seen that a very simple andefficient arm attachment has been produced which is so formed as toallow the loop to be passed over different sized arms, at which time thejaw may be moved by means of the set screw so as to cause the attachmentto be efliciently and positively clamped upon the arm for holding theattachment rigidly ina set position whereby an article may be clampedupon the stump of an arm so as to be easily operated.

signature.

What is claimed is: In an arm attachment of the class described, thecombination of a loop formed from asingle strand of material said loophaving its end portions overlapping, rivets passing through said endportions and through the body portions of said loop for holding the loopin an assembled position,

the portions of said loop between said rivets being spaced apart andprovided withregistering openings, a nut carried Within said spacedportions, said spaced portions fitting snugly upon the side portions ofsaid nut and converging decidedly beyond the side edgesof said nut,whereby said nut. will be held in a set position, a set screw having agrip portionpassing through. said nut and by upon the movement of saidset screw said clamping jaw may be moved so asto cause the attachment tobe clamped upon the stump of an arm for allowing an article to be easilycarried by the attachment.

In testimony whereof I hereunto afiix my I ALDYN T. CRAWFORD.

